Unbalanced to Balanced Filtered Power Divider with Broadband Common Mode Rejection

Abstract

The invention discloses an unbalanced-to-balanced filtering power divider with wideband common mode rejection, which comprises an upper dielectric substrate, a lower dielectric substrate and a commonmetal ground, wherein the upper dielectric substrate and the lower dielectric substrate are provided with an upper surface feeder and a lower surface feeder, the upper surface feeder and the lower surface feeder are symmetrical about the common metal ground and together form a first input port feeder; the position, corresponding to the first input port feeder, on the common metal ground is etchedwith a rectangular defect area, and through match, single-end input is realized; six semi-mode fan-shaped defect ground structures are also etched on the common metal ground; the six semi-mode fan-shaped defect ground structures are divided to two groups; the two groups of semi-mode fan-shaped defect ground structures are symmetrical about the axis of a first coupling line; and the radii of each group of semi-mode fan-shaped defect ground structures along a medial axis direction are increased gradually, and through match, wide common mode rejection is realized. The filtering power divider hasthe advantages of compact structure, wideband common mode rejection, and high out-of-band selectivity and the like.

Description

technical field [0001] The invention relates to a microwave passive device, in particular to an unbalanced-to-balanced filter power splitter with broadband common-mode suppression. Background technique [0002] Because of the common-mode rejection characteristics of balanced circuits, it can effectively reduce system noise and reduce crosstalk of circuit components, and has received more and more attention in communication systems. Literature 1 (W. Feng and W. Che, "Novel widebanddifferential bandpass filters based on T-shaped structure," IEEE Trans. Microw. Theory Techn., vol. 60, no. 6, pp. 1560–1568, Jun. 2012 ) proposed a balanced filter, literature 2 (L.-S. Wu, B. Xia, W.-Y. Yin, and J. Mao, “A half-mode substrate integrated waveguide ring for two-way power division of balanced circuit,” IEEE Microw. Wireless Compon. Lett., vol. 22, no. 7, pp. 333–335, Jul. 2012) proposed a balanced power divider, but they all have differential mode input and output terminal and canno...

AI Technical Summary

Problems solved by technology

However, since there is no additional band-pass filtering capability, it has narrow common-mode rejection, poor pass-band selectivity and harmonic rejection

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